How can you download movies from links?

How can you download movies from links?
To download movies on the internet, one has a multitude of options. BitTorrent sites (1st link below) offer the greatest variety and arguably the highest quality, but require a BitTorrent program (2nd link below) to use. Peer to Peer (P2P) sharing programs are popular as well (3rd link), but can suffer from spyware and virus issues. Lastly, for simple in-browser experiences, there are many sites that stream the latest episodes of TV shows and Movies using adobe Flash or Divx plug-ins (4th link).